What trends do we see on the periodic table for atomic radii, ionic radii and electronegativity?
Mar 11, 2016
Let me explain,
In period from left to right atomic radii decrease while electronegativity increases.
In group from top to bottom atomic radii increase while electronegativity decreases. From left to right nuclear charge increases and no of shell remains the same that's why the [valence electrons](http://socratic.org/chemistry/the-periodic-table/valence-electrons-and-the-periodic-table) come closer to nucleus, thus the size of atom decreases. And from top to bottom the no of shell increases thus the atomic size increases. Electronegativity depends inversely on atomic size. It increases from left to right due to decrease in atomic size. While in group it deceases because atomic size increases.